Word: sonically
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...gene that was almost named warthog and razorback and can claim a popular SEGA Genesis game as its name-sake, the Sonic hedgehog gene plays a crucial role in the development of animals...
...Harvard research teams and one team from the Imperial Cancer Research Fund in Oxford, England, reported in the most recent issue of Cell that they have isolated Sonic hedgehog, a gene they believe is responsible for shaping the embryonic development of limbs and the central nervous system...
Scientists have long known that the posterior, or bottom, portion of the limb bud is important in signalling for developmental patterning. The group's work "demonstrated that the Sonic hedgehog gene encodes the key substance that makes the bottom of the limb bud so special," Tabin said...
Apparently, cells sense the concentration of Sonic hedgehog and then decide what type of cells they should be--for example muscle, bone, or skin cells--and thus determine the ultimate shape of the embryo...
...fact, according to Tabin, in research subsequent to the publishing of the paper, his lab has isolated the human Sonic hedgehog gene. He has also mapped the genes responsible for certain genetically-determined diseases in humans to the same place on the chromosome as Sonic hedgehog...